[PATCH] `nonnull` argument attribute.

[Luqman Aden]

  Added more context and moved test.

http://reviews.llvm.org/D3389

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3389?vs=8553&id=8575#toc

Files:
  test/Transforms/InstCombine/nonnull.ll
  test/Bitcode/attributes.ll
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/Attributes.h
  include/llvm/IR/Argument.h
  lib/Analysis/ValueTracking.cpp
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLToken.h
  lib/AsmParser/LLParser.cpp
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/IR/Function.cpp
  lib/IR/Attributes.cpp
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